<template>
  <div class="component-upload-image">
    <el-upload multiple action="#" list-type="picture-card" :before-upload="handleBeforeUpload" :limit="limit" :on-exceed="handleExceed" name="file" :on-remove="handleRemove" :show-file-list="true" :file-list="fileList" :on-preview="handlePictureCardPreview" :class="{ hide: this.fileList.length >= this.limit }" :on-change="handleFileChange" :http-request="handleupload">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import { fileUpload } from "@/api/system/user";
import { isExternal } from "@/utils/validate";

export default {
  props: {
    valueData: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 20,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg", "mp4", "gif"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: false,
    },
    params: {
      type: String,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: "https://zuowan.oss-cn-beijing.aliyuncs.com", // process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/third/system/file/upload", // 上传的图片服务器地址
      fileList: [],
      files: [], // 新选择的图片数组

      localList: [], //需上传的图片数组
      urlList: [], //图片url数组
    };
  },
  watch: {
    valueData: {
      handler(val) {
        if (val) {

          if (val instanceof Object) {
            if (val.length || val.length == undefined) {
              val = [val];
            }
          }

          if (typeof (val) == 'string') {

            val = JSON.parse(val)
          }

          let list = Array.isArray(val) ? val : this.value.split(",");

          // 首先将值转为数组
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            // this.urlList.push(item);
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1) {
                item = { name: this.baseUrl + item, url: this.baseUrl + item };
              } else {
                item = { name: item.name, url: item.url };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  mounted() {

    this.urlList = this.valueData;

  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      this.updataArray(file, fileList);
    },

    // 图片改变时候调用
    handleFileChange(file, fileList) {
      this.updataArray(file, fileList);
    },

    updataArray(file, fileList) {
      this.urlList = [];
      this.localList = [];
      fileList.forEach((item) => {
        if (isExternal(item.imgUrl)) {
          this.urlList.push(item);
        } else {
          this.localList.push(item);
        }
      });
      let params = this.params;
      this.$emit("uploaded", params, this.urlList);
    },

    // 图片上传给后台
    handleupload(value, resolve, reject) {
      let formdata = new FormData();
      formdata.append("file", value.file);
      formdata.append("score", 4);
      fileUpload(formdata)
        .then((response) => {
          let imgDict = {
            imgUrl: response.data.url,
            name: value.file.name,
            url: response.data.url,
          }
          let params = this.params;

          if (this.limit == 1) {
            this.$emit("uploaded", params, imgDict);
          } else {
            this.urlList.push(imgDict);
            this.$emit("uploaded", params, this.urlList);
          }
        })
        .catch(function (error) {
          // reject(error);
        });
    },

    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      // this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },

    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url.replace(this.baseUrl, "") + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

